Re: Question about inter-thread stack references

Kaz Kylheku <kaz@kylheku.com> wrote:
> message_t request, reply;
>
> init_request(&request, ... args);
>
> if (send_request(other_thread, &request, &reply) == SEND_OK) {
> /* reply object contains reply */
> }


It is more like:


        struct my_request request;
        struct my_reply reply;


        /* request is dead, reply is dead */


        put_stuff_into_request(&request, args);


        /* request is live, reply is dead */


        do_some_bullshit_with_request(&request, args);


        /* request is live, reply is dead */


        err = enqueue_request_and_reply(queue, args, &request, &reply);


        /* request is live, reply is live */


        do_some_bullshit();


        /* request is live, reply is live */


        err = dequeue_request_and_reply(queue, args, &request, &reply);


        /* request is dead, reply is live */


        do_some_bullshit_with_reply(&reply, args);


        /* request is dead, reply is live */


        get_stuff_out_of_reply(&reply, args);


        /* request is dead, reply is dead */


It is OK if both threads are in one function, but it is easy to make a
benign change that breaks things, or worse, usually works.

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